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AD7793B 数据手册 - ADI（亚德诺）
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低功耗，16位/ 24位Σ-Δ型ADC，具有低噪声仪表放大器和嵌入式参考 Low Power, 16/24-Bit Sigma-Delta ADC with Low-Noise In-Amp and Embedded Reference
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AD7793B数据手册
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3-Channel, Low Noise, Low Power, 16-/24-Bit
∑-Δ ADC with On-Chip In-Amp and Reference
AD7792/AD7793
Rev. B
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 www.analog.com
Fax: 781.461.3113 ©2004–2007 Analog Devices, Inc. All rights reserved.
FEATURES
Up to 23 bits effective resolution
RMS noise
40 nV @ 4.17 Hz
85 nV @ 16.7 Hz
Current: 400 μA typical
Power-down: 1 μA maximum
Low noise programmable gain instrumentation amp
Band gap reference with 4 ppm/°C drift typical
Update rate: 4.17 Hz to 470 Hz
3 differential inputs
Internal clock oscillator
Simultaneous 50 Hz/60 Hz rejection
Programmable current sources
On-chip bias voltage generator
Burnout currents
Power supply: 2.7 V to 5.25 V
–40°C to +105°C temperature range
Independent interface power supply
16-lead TSSOP package
Interface
3-wire serial
SPI®, QSPI™, MICROWIRE™, and DSP compatible
Schmitt trigger on SCLK
APPLICATIONS
Thermocouple measurements
RTD measurements
Thermistor measurements
Gas analysis
Industrial process control
Instrumentation
Portable instrumentation
Blood analysis
Smart transmitters
Liquid/gas chromatography
6-digit DVM
FUNCTIONAL BLOCK DIAGRAM
04855-001
DOUT/RD
Y
DIN
SCLK
CS
DV
DD
SERIAL
INTERFACE
AND
CONTROL
LOGIC
Σ-Δ
ADC
AD7792: 16-BIT
AD7793: 24-BIT
AIN1(+)
AIN1(–)
AIN2(+)
AIN2(–)
AV
DD
GND
MUX
V
BIAS
BAND GAP
REFERENCE
INTERNAL
CLOCK
CLK
GND
GND
A
V
DD
REFIN(–)/AIN3(–)
IOUT1
IOUT2
AV
DD
IN-AMPBUF
REFIN(+)/AIN3(+)
Figure 1.
GENERAL DESCRIPTION
The AD7792/AD7793 are low power, low noise, complete
analog front ends for high precision measurement applications.
The AD7792/AD7793 contain a low noise 16-/24-bit ∑-Δ ADC
with three differential analog inputs. The on-chip, low noise
instrumentation amplifier means that signals of small ampli-
tude can be interfaced directly to the ADC. With a gain
setting of 64, the rms noise is 40 nV when the update rate
equals 4.17 Hz.
The devices contain a precision low noise, low drift internal
band gap reference and can accept an external differential
reference. Other on-chip features include programmable
excitation current sources, burnout currents, and a bias voltage
generator. The bias voltage generator sets the common-mode
voltage of a channel to AV
DD
/2.
The devices can be operated with either the internal clock or an
external clock. The output data rate from the parts is software-
programmable and can be varied from 4.17 Hz to 470 Hz.
The parts operate with a power supply from 2.7 V to 5.25 V.
They consume a current of 400 μA typical and are housed in a
16-lead TSSOP package.
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